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http://dx.doi.org/10.5762/KAIS.2018.19.3.699

A Study on the Permeation Properties of Permanent Gases and condensable Vapors through Hexamethyldisiloxane Plasma-Polymerized Membranes  

Oh, Sae-Joong (Department of Environmental and Biochemical Engineering, Sun-Moon University)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.19, no.3, 2018 , pp. 699-706 More about this Journal
Abstract
The permeation properties of plasma polymer membranes were studied for permanent gases such as He, $H_2$, $O_2$, $N_2$, $CH_4$ and condensable vapors such as $CO_2$, $C_2H_4$, $C_3H_8$. The plasma polymers were prepared by the discharge of microwave or radiofrequency(RF) wave. Hexamethyldisiloxane (HMDS) vapor was used as a monomer for plasma polymerization. In HMDS plasma-polymerized membranes prepared under microwave discharge, the permeability coefficient was dependent of the kinetic molecular diameter of the permeate gases. Additionally the membranes showed higher $O_2/N_2$ permselectivity compared to the plasma polymers from radiofrequency discharge. On the contrary, in the HMDS plasma-polymerized membranes prepared under radiofrequency discharge, the permeability coefficient was dependent of the critical temperature of the permeant gases. The membranes showed high selectivities of $C_2H_4$ and $C_3H_8$ over $N_2$. The permeability coefficient of plasma polymerized membranes prepared under microwave discharge was dependent of the molecular diameter of permeant gases because of high crosslinking density of the membrane. However, the crosslinking density of the plasma polymerized membranes prepared under RF discharge was lower because the energy density of RF wave is weaker than that of microwave. Hence, the permeability of RF plasma polymerized membranes became dependent of the critical temperature rather than molecular diameter of the gases.
Keywords
plasma polymerization; hexamethyldisiloxane; permeation; permselectivity; permanent gas;
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